Mark Olson seemed a little anxious to get out under the lights at the Paradise Tuesday night. He walked out while the tech was still onstage testing equipment, followed closely behind by the rest of THE JAYHAWKS, the band he left in 1995. Without so much as an introduction or a “Hello, Boston,” Olson strummed the band into “Wichita,” from the band’s landmark 1992 album Hollywood Town Hall.